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Thakar R, Sultan AH.Thakar R, et al. Among authors: sultan ah.Best Pract Res Clin Obstet Gynaecol. 2004 Feb;18(1):157-73. doi: 10.1016/j.bpobgyn.2003.09.007.Best Pract Res Clin Obstet Gynaecol. 2004.PMID: 15123064Review.